Observation of In-Plane Quantum Griffiths Singularity in Two-Dimensional Crystalline Superconductors
| Autor: | Shichao Qi, Jingchao Fang, Jian Wang, Ying Xing, Haiwen Liu, Chong Liu, Yi Liu, Xi Lin, Xingwang Xie, Qi-Kun Xue, Yanzhao Liu, Junjie Qi, Jian Sun, Lili Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Quantum phase transition
Physics Superconductivity Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Condensed Matter - Superconductivity FOS: Physical sciences General Physics and Astronomy Universality (dynamical systems) Vortex Magnetic field Superconductivity (cond-mat.supr-con) Condensed Matter::Materials Science Singularity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Quantum Critical exponent |
| Zdroj: | Physical Review Letters. 127 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.127.137001 |
| Popis: | Quantum Griffiths singularity (QGS) reveals the profound influence of quenched disorder on the quantum phase transitions, characterized by the divergence of the dynamical critical exponent at the boundary of the vortex glasslike phase, named as quantum Griffiths phase. However, in the absence of vortices, whether the QGS can exist under a parallel magnetic field remains a puzzle. Here, we study the magnetic field induced superconductor--metal transition in ultrathin crystalline ${\mathrm{PdTe}}_{2}$ films grown by molecular beam epitaxy. Remarkably, the QGS emerges under both perpendicular and parallel magnetic field in four-monolayer ${\mathrm{PdTe}}_{2}$ films. The direct activated scaling analysis with a new irrelevant correction has been proposed, providing important evidence of QGS. With increasing film thickness to six monolayers, the QGS disappears under perpendicular field but persists under parallel field, and this discordance may originate from the differences in microscopic processes. Our work demonstrates the universality of parallel field induced QGS and can stimulate further investigations on novel quantum phase transitions under parallel magnetic field. |
| Databáze: | OpenAIRE |
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